Process Control and Instrumentation
Which of the following does not figure in the list of seven substances selected for international temperature scale?

Ice (F.P) and steam (B.P)
Zinc (B.P) and mercury (F.P)
Antimony and silver (F.P)
Oxygen and sulphur (B.P)

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Process Control and Instrumentation
Routh test

Criterion provides information about the actual location of roots
Cannot be used to test the stability of a control system containing transportation lag
Criterion is not applicable to systems with polynomial characteristic equation
Can not determine as to how many roots of the characteristics equation have positive real roots

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